Given the attacker needs to be within close proximity, it doesnt feel like a very concerning risk for most people. The attacker would need to dedicate time to physically come to your location and deliberately target you?

Well, no. The biggest issue is automation. There are already people abusing Bluetooth's nearby devices functionality that makes iPhones and Androids unusable on a subway for example.

The joke is confusing invincible with invisible.

It's called enshittification of platforms. The article is not about Reddit, but applies just as well.